一个简单的React-Native 获取node.js提供的接口的实现 一.node.js var http = require("http"); var url = require("url"); var querystring = require("querystring"); var json1 = '{"state":"1"}'; var json2 = '{"state":&q
获取地球上两经纬度坐标点间的距离,利用[大圆距离公式] A diagram illustrating great-circle distance (drawn in red) between two points on a sphere, P and Q. Two antipodal points, u and v, are also depicted. 谷歌都在用呢, C#实现的代码如下: /// <summary> /// 地球半径 /// </summary> priva